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rt-thread-official/src/timer.c

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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2006-03-12 Bernard first version
* 2006-04-29 Bernard implement thread timer
* 2006-06-04 Bernard implement rt_timer_control
* 2006-08-10 Bernard fix the periodic timer bug
* 2006-09-03 Bernard implement rt_timer_detach
* 2009-11-11 LiJin add soft timer
* 2010-05-12 Bernard fix the timer check bug.
* 2010-11-02 Charlie re-implement tick overflow issue
* 2012-12-15 Bernard fix the next timeout issue in soft timer
* 2014-07-12 Bernard does not lock scheduler when invoking soft-timer
* timeout function.
* 2021-08-15 supperthomas add the comment
* 2022-01-07 Gabriel Moving __on_rt_xxxxx_hook to timer.c
* 2022-04-19 Stanley Correct descriptions
* 2023-09-15 xqyjlj perf rt_hw_interrupt_disable/enable
* 2024-01-25 Shell add RT_TIMER_FLAG_THREAD_TIMER for timer to sync with sched
*/
#include <rtthread.h>
#include <rthw.h>
#define DBG_TAG "kernel.timer"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
/* hard timer list */
static rt_list_t _timer_list[RT_TIMER_SKIP_LIST_LEVEL];
static struct rt_spinlock _htimer_lock;
#ifdef RT_USING_TIMER_SOFT
#ifndef RT_TIMER_THREAD_STACK_SIZE
#define RT_TIMER_THREAD_STACK_SIZE 512
#endif /* RT_TIMER_THREAD_STACK_SIZE */
#ifndef RT_TIMER_THREAD_PRIO
#define RT_TIMER_THREAD_PRIO 0
#endif /* RT_TIMER_THREAD_PRIO */
/* soft timer list */
static rt_list_t _soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL];
static struct rt_spinlock _stimer_lock;
static struct rt_thread _timer_thread;
static struct rt_semaphore _soft_timer_sem;
rt_align(RT_ALIGN_SIZE)
static rt_uint8_t _timer_thread_stack[RT_TIMER_THREAD_STACK_SIZE];
#endif /* RT_USING_TIMER_SOFT */
#if defined(RT_USING_HOOK) && defined(RT_HOOK_USING_FUNC_PTR)
extern void (*rt_object_take_hook)(struct rt_object *object);
extern void (*rt_object_put_hook)(struct rt_object *object);
static void (*rt_timer_enter_hook)(struct rt_timer *timer);
static void (*rt_timer_exit_hook)(struct rt_timer *timer);
/**
* @addtogroup Hook
*/
/**@{*/
/**
* @brief This function will set a hook function on timer,
* which will be invoked when enter timer timeout callback function.
*
* @param hook is the function point of timer
*/
void rt_timer_enter_sethook(void (*hook)(struct rt_timer *timer))
{
rt_timer_enter_hook = hook;
}
/**
* @brief This function will set a hook function, which will be
* invoked when exit timer timeout callback function.
*
* @param hook is the function point of timer
*/
void rt_timer_exit_sethook(void (*hook)(struct rt_timer *timer))
{
rt_timer_exit_hook = hook;
}
/**@}*/
#endif /* RT_USING_HOOK */
rt_inline struct rt_spinlock* _timerlock_idx(struct rt_timer *timer)
{
#ifdef RT_USING_TIMER_SOFT
if (timer->parent.flag & RT_TIMER_FLAG_SOFT_TIMER)
{
return &_stimer_lock;
}
else
#endif /* RT_USING_TIMER_SOFT */
{
return &_htimer_lock;
}
}
/**
* @brief [internal] The init funtion of timer
*
* The internal called function of rt_timer_init
*
* @see rt_timer_init
*
* @param timer is timer object
*
* @param timeout is the timeout function
*
* @param parameter is the parameter of timeout function
*
* @param time is the tick of timer
*
* @param flag the flag of timer
*/
static void _timer_init(rt_timer_t timer,
void (*timeout)(void *parameter),
void *parameter,
rt_tick_t time,
rt_uint8_t flag)
{
int i;
/* set flag */
timer->parent.flag = flag;
/* set deactivated */
timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
timer->timeout_func = timeout;
timer->parameter = parameter;
timer->timeout_tick = 0;
timer->init_tick = time;
/* initialize timer list */
for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
{
rt_list_init(&(timer->row[i]));
}
}
/**
* @brief Find the next emtpy timer ticks
*
* @param timer_list is the array of time list
*
* @param timeout_tick is the next timer's ticks
*
* @return Return the operation status. If the return value is RT_EOK, the function is successfully executed.
* If the return value is any other values, it means this operation failed.
*/
static rt_err_t _timer_list_next_timeout(rt_list_t timer_list[], rt_tick_t *timeout_tick)
{
struct rt_timer *timer;
if (!rt_list_isempty(&timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1]))
{
timer = rt_list_entry(timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1].next,
struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
*timeout_tick = timer->timeout_tick;
return RT_EOK;
}
return -RT_ERROR;
}
/**
* @brief Remove the timer
*
* @param timer the point of the timer
*/
rt_inline void _timer_remove(rt_timer_t timer)
{
int i;
for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
{
rt_list_remove(&timer->row[i]);
}
}
#if (DBG_LVL == DBG_LOG)
/**
* @brief The number of timer
*
* @param timer the head of timer
*
* @return count of timer
*/
static int _timer_count_height(struct rt_timer *timer)
{
int i, cnt = 0;
for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
{
if (!rt_list_isempty(&timer->row[i]))
cnt++;
}
return cnt;
}
/**
* @brief dump the all timer information
*
* @param timer_heads the head of timer
*/
void rt_timer_dump(rt_list_t timer_heads[])
{
rt_list_t *list;
for (list = timer_heads[RT_TIMER_SKIP_LIST_LEVEL - 1].next;
list != &timer_heads[RT_TIMER_SKIP_LIST_LEVEL - 1];
list = list->next)
{
struct rt_timer *timer = rt_list_entry(list,
struct rt_timer,
row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
rt_kprintf("%d", _timer_count_height(timer));
}
rt_kprintf("\n");
}
#endif /* (DBG_LVL == DBG_LOG) */
/**
* @addtogroup Clock
*/
/**@{*/
/**
* @brief This function will initialize a timer
* normally this function is used to initialize a static timer object.
*
* @param timer is the point of timer
*
* @param name is a pointer to the name of the timer
*
* @param timeout is the callback of timer
*
* @param parameter is the param of the callback
*
* @param time is timeout ticks of timer
*
* NOTE: The max timeout tick should be no more than (RT_TICK_MAX/2 - 1).
*
* @param flag is the flag of timer
*
*/
void rt_timer_init(rt_timer_t timer,
const char *name,
void (*timeout)(void *parameter),
void *parameter,
rt_tick_t time,
rt_uint8_t flag)
{
/* parameter check */
RT_ASSERT(timer != RT_NULL);
RT_ASSERT(timeout != RT_NULL);
RT_ASSERT(time < RT_TICK_MAX / 2);
/* timer object initialization */
rt_object_init(&(timer->parent), RT_Object_Class_Timer, name);
_timer_init(timer, timeout, parameter, time, flag);
}
RTM_EXPORT(rt_timer_init);
/**
* @brief This function will detach a timer from timer management.
*
* @param timer is the timer to be detached
*
* @return the status of detach
*/
rt_err_t rt_timer_detach(rt_timer_t timer)
{
rt_base_t level;
struct rt_spinlock *spinlock;
/* parameter check */
RT_ASSERT(timer != RT_NULL);
RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
RT_ASSERT(rt_object_is_systemobject(&timer->parent));
spinlock = _timerlock_idx(timer);
level = rt_spin_lock_irqsave(spinlock);
_timer_remove(timer);
/* stop timer */
timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
rt_spin_unlock_irqrestore(spinlock, level);
rt_object_detach(&(timer->parent));
return RT_EOK;
}
RTM_EXPORT(rt_timer_detach);
#ifdef RT_USING_HEAP
/**
* @brief This function will create a timer
*
* @param name is the name of timer
*
* @param timeout is the timeout function
*
* @param parameter is the parameter of timeout function
*
* @param time is timeout ticks of the timer
*
* NOTE: The max timeout tick should be no more than (RT_TICK_MAX/2 - 1).
*
* @param flag is the flag of timer. Timer will invoke the timeout function according to the selected values of flag, if one or more of the following flags is set.
*
* RT_TIMER_FLAG_ONE_SHOT One shot timing
* RT_TIMER_FLAG_PERIODIC Periodic timing
*
* RT_TIMER_FLAG_HARD_TIMER Hardware timer
* RT_TIMER_FLAG_SOFT_TIMER Software timer
* RT_TIMER_FLAG_THREAD_TIMER Thread timer
*
* NOTE:
* You can use multiple values with "|" logical operator. By default, system will use the RT_TIME_FLAG_HARD_TIMER.
*
* @return the created timer object
*/
rt_timer_t rt_timer_create(const char *name,
void (*timeout)(void *parameter),
void *parameter,
rt_tick_t time,
rt_uint8_t flag)
{
struct rt_timer *timer;
/* parameter check */
RT_ASSERT(timeout != RT_NULL);
RT_ASSERT(time < RT_TICK_MAX / 2);
/* allocate a object */
timer = (struct rt_timer *)rt_object_allocate(RT_Object_Class_Timer, name);
if (timer == RT_NULL)
{
return RT_NULL;
}
_timer_init(timer, timeout, parameter, time, flag);
return timer;
}
RTM_EXPORT(rt_timer_create);
/**
* @brief This function will delete a timer and release timer memory
*
* @param timer the timer to be deleted
*
* @return the operation status, RT_EOK on OK; -RT_ERROR on error
*/
rt_err_t rt_timer_delete(rt_timer_t timer)
{
rt_base_t level;
struct rt_spinlock *spinlock;
/* parameter check */
RT_ASSERT(timer != RT_NULL);
RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
RT_ASSERT(rt_object_is_systemobject(&timer->parent) == RT_FALSE);
spinlock = _timerlock_idx(timer);
level = rt_spin_lock_irqsave(spinlock);
_timer_remove(timer);
/* stop timer */
timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
rt_spin_unlock_irqrestore(spinlock, level);
rt_object_delete(&(timer->parent));
return RT_EOK;
}
RTM_EXPORT(rt_timer_delete);
#endif /* RT_USING_HEAP */
/**
* @brief This function will start the timer
*
* @param timer the timer to be started
*
* @return the operation status, RT_EOK on OK, -RT_ERROR on error
*/
static rt_err_t _timer_start(rt_list_t *timer_list, rt_timer_t timer)
{
unsigned int row_lvl;
rt_list_t *row_head[RT_TIMER_SKIP_LIST_LEVEL];
unsigned int tst_nr;
static unsigned int random_nr;
/* remove timer from list */
_timer_remove(timer);
/* change status of timer */
timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
RT_OBJECT_HOOK_CALL(rt_object_take_hook, (&(timer->parent)));
timer->timeout_tick = rt_tick_get() + timer->init_tick;
row_head[0] = &timer_list[0];
for (row_lvl = 0; row_lvl < RT_TIMER_SKIP_LIST_LEVEL; row_lvl++)
{
for (; row_head[row_lvl] != timer_list[row_lvl].prev;
row_head[row_lvl] = row_head[row_lvl]->next)
{
struct rt_timer *t;
rt_list_t *p = row_head[row_lvl]->next;
/* fix up the entry pointer */
t = rt_list_entry(p, struct rt_timer, row[row_lvl]);
/* If we have two timers that timeout at the same time, it's
* preferred that the timer inserted early get called early.
* So insert the new timer to the end the the some-timeout timer
* list.
*/
if ((t->timeout_tick - timer->timeout_tick) == 0)
{
continue;
}
else if ((t->timeout_tick - timer->timeout_tick) < RT_TICK_MAX / 2)
{
break;
}
}
if (row_lvl != RT_TIMER_SKIP_LIST_LEVEL - 1)
row_head[row_lvl + 1] = row_head[row_lvl] + 1;
}
/* Interestingly, this super simple timer insert counter works very very
* well on distributing the list height uniformly. By means of "very very
* well", I mean it beats the randomness of timer->timeout_tick very easily
* (actually, the timeout_tick is not random and easy to be attacked). */
random_nr++;
tst_nr = random_nr;
rt_list_insert_after(row_head[RT_TIMER_SKIP_LIST_LEVEL - 1],
&(timer->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
for (row_lvl = 2; row_lvl <= RT_TIMER_SKIP_LIST_LEVEL; row_lvl++)
{
if (!(tst_nr & RT_TIMER_SKIP_LIST_MASK))
rt_list_insert_after(row_head[RT_TIMER_SKIP_LIST_LEVEL - row_lvl],
&(timer->row[RT_TIMER_SKIP_LIST_LEVEL - row_lvl]));
else
break;
/* Shift over the bits we have tested. Works well with 1 bit and 2
* bits. */
tst_nr >>= (RT_TIMER_SKIP_LIST_MASK + 1) >> 1;
}
timer->parent.flag |= RT_TIMER_FLAG_ACTIVATED;
return RT_EOK;
}
/**
* @brief This function will start the timer
*
* @param timer the timer to be started
*
* @return the operation status, RT_EOK on OK, -RT_ERROR on error
*/
rt_err_t rt_timer_start(rt_timer_t timer)
{
rt_sched_lock_level_t slvl;
int is_thread_timer = 0;
struct rt_spinlock *spinlock;
rt_list_t *timer_list;
rt_base_t level;
rt_err_t err;
/* parameter check */
RT_ASSERT(timer != RT_NULL);
RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
#ifdef RT_USING_TIMER_SOFT
if (timer->parent.flag & RT_TIMER_FLAG_SOFT_TIMER)
{
timer_list = _soft_timer_list;
spinlock = &_stimer_lock;
}
else
#endif /* RT_USING_TIMER_SOFT */
{
timer_list = _timer_list;
spinlock = &_htimer_lock;
}
if (timer->parent.flag & RT_TIMER_FLAG_THREAD_TIMER)
{
rt_thread_t thread;
is_thread_timer = 1;
rt_sched_lock(&slvl);
thread = rt_container_of(timer, struct rt_thread, thread_timer);
RT_ASSERT(rt_object_get_type(&thread->parent) == RT_Object_Class_Thread);
rt_sched_thread_timer_start(thread);
}
level = rt_spin_lock_irqsave(spinlock);
err = _timer_start(timer_list, timer);
#ifdef RT_USING_TIMER_SOFT
if (err == RT_EOK && (timer->parent.flag & RT_TIMER_FLAG_SOFT_TIMER))
{
rt_sem_release(&_soft_timer_sem);
}
#endif /* RT_USING_TIMER_SOFT */
rt_spin_unlock_irqrestore(spinlock, level);
if (is_thread_timer)
{
rt_sched_unlock(slvl);
}
return err;
}
RTM_EXPORT(rt_timer_start);
/**
* @brief This function will stop the timer
*
* @param timer the timer to be stopped
*
* @return the operation status, RT_EOK on OK, -RT_ERROR on error
*/
rt_err_t rt_timer_stop(rt_timer_t timer)
{
rt_base_t level;
struct rt_spinlock *spinlock;
/* timer check */
RT_ASSERT(timer != RT_NULL);
RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
spinlock = _timerlock_idx(timer);
level = rt_spin_lock_irqsave(spinlock);
if (!(timer->parent.flag & RT_TIMER_FLAG_ACTIVATED))
{
rt_spin_unlock_irqrestore(spinlock, level);
return -RT_ERROR;
}
RT_OBJECT_HOOK_CALL(rt_object_put_hook, (&(timer->parent)));
_timer_remove(timer);
/* change status */
timer->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
rt_spin_unlock_irqrestore(spinlock, level);
return RT_EOK;
}
RTM_EXPORT(rt_timer_stop);
/**
* @brief This function will get or set some options of the timer
*
* @param timer the timer to be get or set
* @param cmd the control command
* @param arg the argument
*
* @return the statu of control
*/
rt_err_t rt_timer_control(rt_timer_t timer, int cmd, void *arg)
{
struct rt_spinlock *spinlock;
rt_base_t level;
/* parameter check */
RT_ASSERT(timer != RT_NULL);
RT_ASSERT(rt_object_get_type(&timer->parent) == RT_Object_Class_Timer);
spinlock = _timerlock_idx(timer);
level = rt_spin_lock_irqsave(spinlock);
switch (cmd)
{
case RT_TIMER_CTRL_GET_TIME:
*(rt_tick_t *)arg = timer->init_tick;
break;
case RT_TIMER_CTRL_SET_TIME:
RT_ASSERT((*(rt_tick_t *)arg) < RT_TICK_MAX / 2);
timer->init_tick = *(rt_tick_t *)arg;
break;
case RT_TIMER_CTRL_SET_ONESHOT:
timer->parent.flag &= ~RT_TIMER_FLAG_PERIODIC;
break;
case RT_TIMER_CTRL_SET_PERIODIC:
timer->parent.flag |= RT_TIMER_FLAG_PERIODIC;
break;
case RT_TIMER_CTRL_GET_STATE:
if(timer->parent.flag & RT_TIMER_FLAG_ACTIVATED)
{
/*timer is start and run*/
*(rt_uint32_t *)arg = RT_TIMER_FLAG_ACTIVATED;
}
else
{
/*timer is stop*/
*(rt_uint32_t *)arg = RT_TIMER_FLAG_DEACTIVATED;
}
break;
case RT_TIMER_CTRL_GET_REMAIN_TIME:
*(rt_tick_t *)arg = timer->timeout_tick;
break;
case RT_TIMER_CTRL_GET_FUNC:
*(void **)arg = (void *)timer->timeout_func;
break;
case RT_TIMER_CTRL_SET_FUNC:
timer->timeout_func = (void (*)(void*))arg;
break;
case RT_TIMER_CTRL_GET_PARM:
*(void **)arg = timer->parameter;
break;
case RT_TIMER_CTRL_SET_PARM:
timer->parameter = arg;
break;
default:
break;
}
rt_spin_unlock_irqrestore(spinlock, level);
return RT_EOK;
}
RTM_EXPORT(rt_timer_control);
/**
* @brief This function will check timer list, if a timeout event happens,
* the corresponding timeout function will be invoked.
*
* @note This function shall be invoked in operating system timer interrupt.
*/
void rt_timer_check(void)
{
struct rt_timer *t;
rt_tick_t current_tick;
rt_base_t level;
rt_list_t list;
RT_ASSERT(rt_interrupt_get_nest() > 0);
LOG_D("timer check enter");
level = rt_spin_lock_irqsave(&_htimer_lock);
current_tick = rt_tick_get();
#ifdef RT_USING_SMP
/* Running on core 0 only */
if (rt_hw_cpu_id() != 0)
{
rt_spin_unlock_irqrestore(&_htimer_lock, level);
return;
}
#endif
rt_list_init(&list);
while (!rt_list_isempty(&_timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1]))
{
t = rt_list_entry(_timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1].next,
struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
/*
* It supposes that the new tick shall less than the half duration of
* tick max.
*/
if ((current_tick - t->timeout_tick) < RT_TICK_MAX / 2)
{
RT_OBJECT_HOOK_CALL(rt_timer_enter_hook, (t));
/* remove timer from timer list firstly */
_timer_remove(t);
if (!(t->parent.flag & RT_TIMER_FLAG_PERIODIC))
{
t->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
}
/* add timer to temporary list */
rt_list_insert_after(&list, &(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
rt_spin_unlock_irqrestore(&_htimer_lock, level);
/* call timeout function */
t->timeout_func(t->parameter);
/* re-get tick */
current_tick = rt_tick_get();
RT_OBJECT_HOOK_CALL(rt_timer_exit_hook, (t));
LOG_D("current tick: %d", current_tick);
level = rt_spin_lock_irqsave(&_htimer_lock);
/* Check whether the timer object is detached or started again */
if (rt_list_isempty(&list))
{
continue;
}
rt_list_remove(&(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
if ((t->parent.flag & RT_TIMER_FLAG_PERIODIC) &&
(t->parent.flag & RT_TIMER_FLAG_ACTIVATED))
{
/* start it */
t->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
_timer_start(_timer_list, t);
}
}
else break;
}
rt_spin_unlock_irqrestore(&_htimer_lock, level);
LOG_D("timer check leave");
}
/**
* @brief This function will return the next timeout tick in the system.
*
* @return the next timeout tick in the system
*/
rt_tick_t rt_timer_next_timeout_tick(void)
{
rt_base_t level;
rt_tick_t next_timeout = RT_TICK_MAX;
level = rt_spin_lock_irqsave(&_htimer_lock);
_timer_list_next_timeout(_timer_list, &next_timeout);
rt_spin_unlock_irqrestore(&_htimer_lock, level);
return next_timeout;
}
#ifdef RT_USING_TIMER_SOFT
/**
* @brief This function will check software-timer list, if a timeout event happens, the
* corresponding timeout function will be invoked.
*/
static void _soft_timer_check(void)
{
rt_tick_t current_tick;
struct rt_timer *t;
rt_base_t level;
rt_list_t list;
rt_list_init(&list);
LOG_D("software timer check enter");
level = rt_spin_lock_irqsave(&_stimer_lock);
while (!rt_list_isempty(&_soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1]))
{
t = rt_list_entry(_soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1].next,
struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
current_tick = rt_tick_get();
/*
* It supposes that the new tick shall less than the half duration of
* tick max.
*/
if ((current_tick - t->timeout_tick) < RT_TICK_MAX / 2)
{
RT_OBJECT_HOOK_CALL(rt_timer_enter_hook, (t));
/* remove timer from timer list firstly */
_timer_remove(t);
if (!(t->parent.flag & RT_TIMER_FLAG_PERIODIC))
{
t->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
}
/* add timer to temporary list */
rt_list_insert_after(&list, &(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
rt_spin_unlock_irqrestore(&_stimer_lock, level);
/* call timeout function */
t->timeout_func(t->parameter);
RT_OBJECT_HOOK_CALL(rt_timer_exit_hook, (t));
LOG_D("current tick: %d", current_tick);
level = rt_spin_lock_irqsave(&_stimer_lock);
/* Check whether the timer object is detached or started again */
if (rt_list_isempty(&list))
{
continue;
}
rt_list_remove(&(t->row[RT_TIMER_SKIP_LIST_LEVEL - 1]));
if ((t->parent.flag & RT_TIMER_FLAG_PERIODIC) &&
(t->parent.flag & RT_TIMER_FLAG_ACTIVATED))
{
/* start it */
t->parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
_timer_start(_soft_timer_list, t);
}
}
else break; /* not check anymore */
}
rt_spin_unlock_irqrestore(&_stimer_lock, level);
LOG_D("software timer check leave");
}
/**
* @brief System timer thread entry
*
* @param parameter is the arg of the thread
*/
static void _timer_thread_entry(void *parameter)
{
rt_err_t ret = RT_ERROR;
rt_tick_t next_timeout;
rt_base_t level;
RT_UNUSED(parameter);
rt_sem_control(&_soft_timer_sem, RT_IPC_CMD_SET_VLIMIT, (void*)1);
while (1)
{
/* get the next timeout tick */
level = rt_spin_lock_irqsave(&_stimer_lock);
ret = _timer_list_next_timeout(_soft_timer_list, &next_timeout);
rt_spin_unlock_irqrestore(&_stimer_lock, level);
if (ret != RT_EOK)
{
rt_sem_take(&_soft_timer_sem, RT_WAITING_FOREVER);
}
else
{
rt_tick_t current_tick;
/* get current tick */
current_tick = rt_tick_get();
if ((next_timeout - current_tick) < RT_TICK_MAX / 2)
{
/* get the delta timeout tick */
next_timeout = next_timeout - current_tick;
rt_sem_take(&_soft_timer_sem, next_timeout);
}
}
/* check software timer */
_soft_timer_check();
}
}
#endif /* RT_USING_TIMER_SOFT */
/**
* @ingroup SystemInit
*
* @brief This function will initialize system timer
*/
void rt_system_timer_init(void)
{
rt_size_t i;
for (i = 0; i < sizeof(_timer_list) / sizeof(_timer_list[0]); i++)
{
rt_list_init(_timer_list + i);
}
rt_spin_lock_init(&_htimer_lock);
}
/**
* @ingroup SystemInit
*
* @brief This function will initialize system timer thread
*/
void rt_system_timer_thread_init(void)
{
#ifdef RT_USING_TIMER_SOFT
int i;
for (i = 0;
i < sizeof(_soft_timer_list) / sizeof(_soft_timer_list[0]);
i++)
{
rt_list_init(_soft_timer_list + i);
}
rt_spin_lock_init(&_stimer_lock);
rt_sem_init(&_soft_timer_sem, "stimer", 0, RT_IPC_FLAG_PRIO);
/* start software timer thread */
rt_thread_init(&_timer_thread,
"timer",
_timer_thread_entry,
RT_NULL,
&_timer_thread_stack[0],
sizeof(_timer_thread_stack),
RT_TIMER_THREAD_PRIO,
10);
/* startup */
rt_thread_startup(&_timer_thread);
#endif /* RT_USING_TIMER_SOFT */
}
/**@}*/
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